CN100375825C - Lifting moving windproof net device - Google Patents
Lifting moving windproof net device Download PDFInfo
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- CN100375825C CN100375825C CNB2006100135926A CN200610013592A CN100375825C CN 100375825 C CN100375825 C CN 100375825C CN B2006100135926 A CNB2006100135926 A CN B2006100135926A CN 200610013592 A CN200610013592 A CN 200610013592A CN 100375825 C CN100375825 C CN 100375825C
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Abstract
The present invention provides an elevation type moving windproof net device which comprises a windproof net, a moving device and a driving elevating device, wherein the windproof net and the driving elevating device are arranged on the same platform. A plurality of corresponding supporting columns which are ranged in a front row and a back row are arranged on the platform, and a connecting frame is arranged on the top ends of every two supporting columns which correspond to each other in the front row and the back row. The windproof net is fixed on the supporting columns in the front row, one end of an oblique supporting column is fixedly connected to two supporting columns which are arranged in the back row and on both sides of the platform, and the other end of the oblique supporting column is fixed on the end of one side of the platform. The driving elevating device is arranged in the middle of the platform to control the rise and the fall of the windproof net. The windproof net has the advantages of low operation cost to control dust pollution, water resource saving and long service life of more than 20 years. In addition, the windproof net can be moved, raised and lowered at any time. The device is arranged in a bulk material piling field upwind, which can effectively reduce the wind speed of flow wind, decrease the functions of wind and reduce the pulse speed and the functions of the wind; thus, the purpose of effectively reducing dust is achieved, and surrounding environment quality is improved greatly.
Description
Technical field
The present invention relates to a kind of lifting moving windproof net device.
Background technology
Harbour Coal Transport and processing industry are bigger growth trend every year at present, and with regard to about 5.7 hundred million tons of the annual coal handling capacity in China major port, the coal processing industry can reach 1.9 hundred million tons every year.Development along with Coal Transport and processing industry; the dust pollution of its generation also is on the rise. be the environment of protecting the mankind to depend on for existence; countries in the world have taked different measure to suppress dust pollution; wherein fixed windproof net is exactly the effective way that solves the storage yard dust pollution, and this technology has obtained extensive use at home, outward.Yet the dust pollution of (pulverizing) industry of storage yard coal processing is not at present still effectively solved, and has following problem mainly due to coal processing:
1. produce relatively large dust during comminution process, pollute comparatively seriously, its health and surrounding environment to the staff is all brought bigger influence.
2. the operation field mobility is bigger, mainly along with the stockyard dump is piled up neatly and the buttress operation, and promptly non-Fixed Point Operation, this brings very big difficulty with regard to the improvement of giving dust.
3. the comminution process scene generally is located at openr place, working area all is in the zone between stacking and the stacking about 20 square metres, on this position because its outside distinguished and admirable influence that is subjected to stacking, easily produce the local turbulence zone, thereby cause this regional dust pollution aggravation.
To above-mentioned present situation, the main settling mode in home and abroad (comprising the U.S., Singapore, Japan) is watering and spray for dust suppression.Cause shortcomings such as coal is of poor quality but watering exists with spraying that cost is higher, coal humidity is excessive.Also there are indivedual processing bases to adopt fixed point to pulverize in addition, but distance occurs storing up, increase problems such as processing charges, so up to the present still there is not good settling mode.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the purpose of this invention is to provide a kind of lifting moving windproof net device, process the situation that the dust pollution of (pulverizing) is on the rise to solve present coal, by reducing the distinguished and admirable and turbulivity of coal processing operation field, solve the dust pollution question of harbour coal processing operation field.
For achieving the above object, technical solution of the present invention provides a kind of lifting moving windproof net device, this device includes windproof net, wherein: this device also includes mobile device and transmission lifting gear, described windproof net and transmission lifting gear are arranged on the identical platform, many corresponding mutually support columns of two rows before and after described platform is provided with, support column top corresponding before and after per two is provided with link, described windproof net is fixed on the described front-seat support column, the end that is fixedly connected with the bearing diagonal post on those two support columns of platform both sides that leans at back row's support column, the other end of bearing diagonal post is fixed on a side end of platform, be provided with the transmission lifting gear at middle part by described platform, this transmission lifting gear is connected with traction balance device on being fixed on platform, to control the lifting of windproof net; Lean on the edge of windproof net one side to be provided with subaerial paravent at described platform, be provided with roller in the bottom of described platform, a side wheel is a deflecting roller, and the opposite side roller is a directional wheel.
The support column of described front and rear row is telescopic cover type post.
Described transmission lifting gear is set to manual hoisting device, this device comprises hand control wheel and is fixed on the rocking handle that hand control is taken turns, drive and the interlock of hand control wheel meshed gears, drive the screw thread elevating lever transmission that is connected with described support column, realize the lifting of support column.
Described transmission lifting gear is set to Motorized lift device, and this device includes electric control box, electric control box support, the motor that is electrically connected with electric control box, screw thread lifting shaft; Motor links by gear, drives the screw thread lifting shaft transmission that is connected with described support column, realizes the lifting of support column.
Be provided with a height limiting device in the described Motorized lift device, include Metallic rod, two travel switches; Outer bottom at front-seat support column is welded with a metal gasket, when windproof net is raised to the top height, metal gasket contacts the travel switch of the internal layer top control lifting height that is positioned at front-seat support column, and this moment, travel switch cut off the power supply the whole system device automatically, and windproof net will no longer rise; Be fixed with a Metallic rod on the row's support column of back, when windproof net dropped to terminal height, Metallic rod can touch the travel switch of the inboard control of back row's support column falling head.
Described windproof netting gear has perforate, and the profile of windproof net is a butterfly plate.
The hole shape of described windproof net is round or disciform pass.
The material of described windproof net is paling net, stainless steel cloth, expanded metal lath, aluminium expanded sheets, glass steel mesh, nylon mesh grid, polyester weave mesh, high density polyethylene (HDPE) net, gathers a kind of of second-ethyl acetate.
The diameter of described platform bottom roller is 25cm-30cm.
Effect of the present invention is that this lifting moving windproof net device has bigger advance with the watering, the spray pattern that adopt at present, be mainly reflected in saving running cost, windproof net is for the control dust pollution, running cost is low, only simply safeguards to get final product the conserve water resource, long service life, sustainable use is more than 20 years, and is easy to operate, can move at any time and lifting.This device is located at bulk cargo stockyard upwind, can effectively reduce the wind speed of incoming flow wind, reduces the fluctuation velocity and the wind-force of wind, reaches the purpose that effective minimizing plays dirt.Not only reduce the generation of stockyard coal dust, and effectively controlled descending slowly and lightly of micronic dust.Meet the requirement of national macro environment laws and regulations on the management, improved environmental quality on every side greatly, guaranteed people's health, had very big environmental benefit and social benefit.
Description of drawings
Facad structure schematic diagram when Fig. 1 does not raise for the manual embodiment of windproof net device of the present invention;
Structure schematic diagram when Fig. 2 does not raise for the manual embodiment of windproof net device of the present invention;
Side structure schematic diagram when Fig. 3 does not raise for the manual embodiment of windproof net device of the present invention;
Facad structure schematic diagram when Fig. 4 does not raise for the electronic embodiment of windproof net device of the present invention;
Structure schematic diagram when Fig. 5 does not raise for the electronic embodiment of windproof net device of the present invention;
Side structure schematic diagram when Fig. 6 does not raise for the electronic embodiment of windproof net device of the present invention;
Fig. 7 is the local enlarged diagram of Fig. 6;
Fig. 8 is a Facad structure schematic diagram after the electronic embodiment of windproof net device of the present invention raises.
Among the figure:
1, deflecting roller 2, directional wheel
3, connector 4, platform
4-1, platform move connector 5, transmission lifting gear
6, hand control wheel 6-1, rocking handle
7, back support column 8, oblique volumn supporting
9, link 10, support column top connector
11, wind protection screen 12, traction balance device
12-1, top retainer ring 12-2, oblique rollering steel rope
13, paravent 14, front-seat support column
15, electric control box 15-1, electric control box support
16, screw thread lifting shaft 17, Metallic rod
The specific embodiment
Reaching embodiment in conjunction with the accompanying drawings is illustrated structure of the present invention and course of action.
Lifting moving windproof net device of the present invention includes windproof net, mobile device and transmission lifting gear, described windproof net and transmission lifting gear are arranged on the identical platform 4, many corresponding mutually support columns of two rows before and after described platform 4 is provided with, the support column of front and rear row is telescopic cover type post.Support column top corresponding before and after per two is provided with link 9, described windproof net is fixed on the described front-seat support column 14, the end that is fixedly connected with bearing diagonal post 8 on those two support columns of platform 4 both sides that leans at back row's support column 7, the other end of bearing diagonal post 8 is fixed on a side end of platform 4, be provided with the transmission lifting gear at middle part by described platform 4, this transmission lifting gear is connected with traction balance device 12 on being fixed on platform 4, to control the lifting of windproof net; Lean on the edge of windproof net one side to be provided with subaerial paravent 13 at described platform 4, be provided with roller in the bottom of described platform 4, the diameter of roller is 25cm-30cm.One side wheel is a deflecting roller, and the opposite side roller is a directional wheel.
As shown in Figure 1, 2, 3, described transmission lifting gear is set to manual hoisting device, this device comprises hand control wheel 6 and is fixed on rocking handle 6-1 on the hand control wheel 6, drive with hand control and take turns the interlock of 6 meshed gears, drive the screw thread elevating lever transmission that is connected with described support column, realize the lifting of support column.
Shown in Fig. 4,5,6,7, described transmission lifting gear is set to Motorized lift device, and this device includes electric control box 15, electric control box support 15-1, the motor 15-2 that is electrically connected with electric control box 15, screw thread lifting shaft 16; Motor 15-2 links by gear, drives screw thread lifting shaft 16 transmissions that are connected with described support column, realizes the lifting of support column.In Motorized lift device, be provided with a height limiting device, include Metallic rod 17, travel switch 17-1, travel switch 17-2; Outer bottom at front-seat support column 14 is welded with a metal gasket, when windproof net 11 is raised to the top height, metal gasket contacts the travel switch 17-2 of the internal layer top control lifting height that is positioned at front-seat support column 14, this moment, travel switch cut off the power supply the whole system device automatically, and windproof net 11 will no longer rise; The Metallic rod 17 that a 42cm is fixed in welding on the row's support column 7 of back, when windproof net 11 dropped to terminal height, Metallic rod 17 can touch the travel switch 17-1 of back row's support column 7 inboard control falling heads.This moment, travel switch cut off the power supply the whole system device automatically, and windproof net 11 will no longer descend.
Lifting moving windproof net of the present invention has certain percent opening, and hole shape is round or disciform pass, and its profile is a butterfly plate.The profile of this windproof net also can adopt other different favourable windproof shape, and its hole shape also can have multiple pass.The material of windproof net 11 is any material of paling net, stainless steel cloth, expanded metal lath, aluminium expanded sheets, glass steel mesh, nylon mesh grid, polyester weave mesh, high density polyethylene (HDPE) net, poly-second-ethyl acetate.
Implementer's case of lifting moving windproof net device of the present invention is the variation along with the operation field migration, and this product adopts packaged type to design, and can move along with the migration of operation field.For reducing the pollution of dust, adopt windproof net as the wind speed and the turbulivity that reduce operation field.Be convenient and use, adopt ascending/decending to handle, promptly windproof net can be brought up to certain height in use, but not the activity duration windproof net is reduced, and do not influence other operation of operation field.
The present embodiment adopts automatically and two kinds of forms of hand-operated lifting, and hand-operated lifting adopts and shakes wheel, controls the height of windproof net with manpower; Electric up-down adopts devices such as motor and speed changer to realize.Owing to consider the characteristic of on-the-spot dust, lifting gear adopts mechanical drive mode to realize, thereby eliminates the destruction that coal dust causes its influence.Because there are certain proportionate relationship in the height and the windproof net effect of windproof net, this device can be realized adjusting its height automatically according to the situations such as size of operation field scope.Windproof net in this device adopts the butterfly plate with certain percent opening to want element as reduction is distinguished and admirable with windproof host turbulent flow.
Device of the present invention and course of action are achieved in that
The bulk shape of this device is that outward appearance is a butterfly plate, gives a kind of sensation clean and tidy, attractive in appearance of people, and it is yellow that integral color is, and wind protection screen is a white, color clear.This device mainly is divided into windproof net, mobile device and lifting gear three parts.Windproof net and lifting gear are to be connected on the platform 4 of a 3m * 1.8m * 0.1m.8 corresponding mutually cover type support columns that can raise of two rows before and after having on the platform 4, windproof net 11 had both been fixed in its effect, can realize the lifting of windproof net 11 again.This installation weight is 1.5 tons.
Windproof net 11 is to be made of 9 wind protection screens, and the height of every wind protection screen is 47cm, and the height that the windproof net 11 of whole movable type rises is 5 meters.The material of windproof net 11, according to the actual conditions difference, the difference of environment for use and difference.The material of windproof net 11 generally adopts paling net, stainless steel cloth, expanded metal lath, aluminium expanded sheets, glass steel mesh, nylon mesh grid, polyester weave mesh, high density polyethylene (HDPE) net, EVA etc.The wind protection screen of this device is the thick dish-like steel plate of 1.5cm.The percent opening of windproof net 11 is to realize that by the different arrangement modes in different apertures, pass and hole pass is diversified, and this device is to adopt round or disciform pass.Different percent openings has different protection effects, determine according to environment and the purpose used.
Mobile device can make things convenient for arbitrarily whole device and moves, and this device adopts traditional four rolling formula mobile device.By diameter is 28cm, and thickness is that the complete real rubber tyre of 7cm constitutes.This device roller is owing to be complete real rubber tyre, thereby the crushing resistance of this tire is stronger, can bear heavier pressure and indeformable.The bearing of wheel is formed with the wide fusiformis steel plate of 8cm by 6cm is wide, adopts the fusiformis steel plate to strengthen the weight capacity of wheel.Whole roller height overhead is 36cm, and such height strengthens the degree of freedom of whole device in moving, convenient moving.In addition, two rollers in this device left side are directional wheel, and two rollers on right side are deflecting roller, can arbitrarily angledly rotate.She Ji purpose is like this, can run into a lot of special circumstances during owing to site work, if windproof net device can not well be fixed, then can bring influence to dustproof work, and the dustproof effect also can weaken a lot.So adopts on one side and adjust angle, and another side plays the roller of orientation, neither can influence the whole fixing effect of playing again of moving.The paravent 13 of one row's rubber material has been installed in the front of device, because apparatus platform 4 bottoms overhead highly are 36cm, wind can see through this space and cause dirt, therefore adds a paravent 13 and can stop distinguished and admirable passing through.Also have on the right side of device two long for the platform of 9cm moves connector 4-1, be because the weight of installing is bigger, must drag and could move by vehicle.
The lifting gear of this device adopts hand-operated lifting and two kinds of up-down modes of electric up-down.The principal character of hand-operated lifting is that to rotate diameter be the height that the hand control wheel 6 of 40cm is controlled windproof net 11 to manpower, also be connected with the long rocking handle 6-1 of a 10cm above, this device includes manual hoisting device 5, hand control wheel 6, rocking handle 6-1 and windproof net traction balance device 12.Earlier the steel wire on the windproof net traction balance device 12 is being taken before the windproof net work.The rotating shaft that hand control wheel 6 connects in the lifting gear 5 by hand-power control rocking handle 6-1, drives with hand control and takes turns the interlock of 6 meshed gears again, drives the screw thread elevating lever transmission that is connected with described support column, realizes the lifting of support column, reaches manual transmission.
The primary structure of electric up-down is to be provided with transmission lifting gear, electric control box support 15-1, motor 15-2, screw thread lifting shaft 16 and the windproof net traction balance device 12 that comprises electric control box 15 at platform 4 middle parts of windproof net 11.Earlier the steel wire on the windproof net traction balance device 12 is being taken before the windproof net work, the work by operation electric control box control motor again by the motion of driven by motor axle, reaches electronic transmission.The motor 15-2 that is electrically connected with electric control box 15, screw thread lifting shaft 16 by the interlock of motor 15-2 gear, drive screw thread lifting shaft 16 transmissions that are connected with described support column, realize the lifting of support column.In Motorized lift device, be provided with a height limiting device, include Metallic rod 17, travel switch 17-1, travel switch 17-2, be welded with a metal gasket in the outer bottom of front-seat support column 14.When windproof net 11 was raised to the top height, metal gasket contacted the travel switch 17-2 of the internal layer top control lifting height that is positioned at front-seat support column 14, and this moment, travel switch cut off the power supply the whole system device automatically, and windproof net 11 will no longer rise; The Metallic rod 17 that a 42cm is fixed in welding on the row's support column 7 of back, when windproof net 11 dropped to terminal height, Metallic rod 17 can touch the travel switch 17-1 of back row's support column 7 inboard control falling heads.This moment, travel switch cut off the power supply the whole system device automatically, and windproof net 11 will no longer descend.This structure considers from the device security performance, prevented the appearance of problem such as the windproof net support column of ascending/decending disconnection.And in hand-operated lifting, after rising to maximum height and minimum altitude, hand control wheel 6 will no longer rotate.Guaranteed the security performance of windproof net 11 in lifting process like this.
During electric up-down, can or fall with the liter of the windproof net 11 of button control, the electric control box 15 control cards of electric up-down are made up of 6 buttons and 2 indicator lamps, and 2 indicator lamps in left side are when being green interval scale energising, and indicator lamp is that red interval scale cuts off the power supply.Be energising when two buttons of lower left are green, be outage when red.The right side keep left one group of button on limit when green for rising, when button is red for stopping; When the one group of button on limit of keeping right is green for descending, when red for stopping.
The use lifting gear considers that mainly this device can rise to certain height with windproof net 11 in use, and when not using, windproof net 11 can be reduced, thereby does not influence other operation of operation field.Secondly the elevating function of windproof net 11 can be made different variations according to the difference of field condition.Because there are certain proportionate relationship in the height of windproof net 11 and the effect of windproof net, this device can be realized adjusting its suitable height automatically according to the situation of operation field.
Dustproof, the depositing dust that are suitable for the middle-size and small-size stockyards such as coal stockyard, ore stockyard, generating field and coal processing industry of harbour and hinterland during this device uses.
Depend on the restriction of the conditions such as Material Strength, anti-corrosive properties of wind protection screen the application life of windproof net 11, this device adopts expanded metal lath, and with respect to other several materials, the application life of expanded metal lath is longer, generally can use more than 20 years.
The operating process of this device is fairly simple, convenient.Use hand-operated lifting formula moving windproof net device, stop over is good at first to determine windproof net 11, and manpower shakes hand control wheel 6 then, and clockwise direction shakes rocking handle 6-1, and windproof net 11 rises.When rising to the best height of protection effect, windproof net 11 can stop.After finishing using, can shake hand control wheel 6 to counterclockwise, windproof net 11 can be fallen withdrawal.
Use the electric lifting moving windproof net device, determine that windproof net 11 stops good and power supply can begin to operate after opening.At first press the green button energising in two buttons of lower left, this moment, the indicator lamp green light was bright, and expression is switched on, pressed the green color key that the right side keeps left in one group of button on limit then and rose.After rising to the height that needs, press the red color keys that the right side keeps left in one group of button on limit and stop.After finishing using, it is green for descending to press one group of button on the limit of keeping right, and red for stopping, windproof net 11 can be fallen withdrawal at this moment.
Claims (9)
1. lifting moving windproof net device, this device includes windproof net, it is characterized in that: this device also includes mobile device and transmission lifting gear, described windproof net and transmission lifting gear are arranged on the identical platform (4), many corresponding mutually support columns of two rows before and after described platform (4) is provided with, support column top corresponding before and after per two is provided with link (9), described windproof net is fixed on the described front-seat support column (14), the end that is fixedly connected with bearing diagonal post (8) on those two support columns of platform (4) both sides that leans at back row's support column (7), the other end of bearing diagonal post (8) is fixed on the side end of platform (4), be provided with the transmission lifting gear at middle part by described platform (4), this transmission lifting gear is connected with traction balance device (12) on being fixed on platform (4), to control the lifting of windproof net; Lean on the edge of windproof net one side to be provided with subaerial paravent (13) at described platform (4), be provided with roller in the bottom of described platform (4), a side wheel is a deflecting roller, and the opposite side roller is a directional wheel.
2. lifting moving windproof net device according to claim 1 is characterized in that: the support column of described front and rear row is telescopic cover type post.
3. lifting moving windproof net device according to claim 1, it is characterized in that: described transmission lifting gear is set to manual hoisting device, this device comprises hand control wheel (6) and is fixed on rocking handle (6-1) on the hand control wheel (6), drive and the interlock of hand control wheel (6) meshed gears, drive the screw thread elevating lever transmission that is connected with described support column, realize the lifting of support column.
4. lifting moving windproof net device according to claim 1, it is characterized in that: described transmission lifting gear is set to Motorized lift device, and this device includes electric control box (15), electric control box support (15-1), the motor (15-2) that is electrically connected with electric control box (15), screw thread lifting shaft (16); Motor (15-2) drives screw thread lifting shaft (16) transmission that is connected with described support column by the gear interlock, realizes the lifting of support column.
5. lifting moving windproof net device according to claim 4, it is characterized in that: be provided with a height limiting device in the described Motorized lift device, include the travel switch (17-1) of Metallic rod (17), control falling head, the travel switch (17-2) of control lifting height; Outer bottom at front-seat support column (14) is welded with a metal gasket, when windproof net (11) is raised to the top height, metal gasket contacts the travel switch (17-2) of the internal layer top control lifting height that is positioned at front-seat support column (14), this moment, travel switch cut off the power supply the whole system device automatically, and windproof net (11) will no longer rise; Be fixed with a Metallic rod (17) on back row's support column (7), when windproof net (11) dropped to terminal height, Metallic rod (17) can touch the travel switch (17-1) of the inboard control of back row's support column (7) falling head.
6. lifting moving windproof net device according to claim 1 is characterized in that: described windproof netting gear has perforate, and the profile of windproof net is a butterfly plate.
7. lifting moving windproof net device according to claim 6 is characterized in that: the hole shape of described windproof net is round or disciform pass.
8. lifting moving windproof net device according to claim 1 is characterized in that: the material of described windproof net is paling net, stainless steel cloth, expanded metal lath, aluminium expanded sheets, glass steel mesh, nylon mesh grid, polyester weave mesh, high density polyethylene (HDPE) net, gathers a kind of of second-ethyl acetate.
9. lifting moving windproof net device according to claim 1 is characterized in that: the diameter of described platform (4) bottom roller is 25cm-30cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100135926A CN100375825C (en) | 2006-04-30 | 2006-04-30 | Lifting moving windproof net device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100135926A CN100375825C (en) | 2006-04-30 | 2006-04-30 | Lifting moving windproof net device |
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| CN1865636A CN1865636A (en) | 2006-11-22 |
| CN100375825C true CN100375825C (en) | 2008-03-19 |
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| CNB2006100135926A Expired - Fee Related CN100375825C (en) | 2006-04-30 | 2006-04-30 | Lifting moving windproof net device |
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| JP2002088719A (en) * | 2000-09-20 | 2002-03-27 | Shinichi Demachi | Protection net device against wind |
| JP2004298010A (en) * | 2003-03-28 | 2004-10-28 | Ushirozawa Shoten:Kk | System for simultaneously opening/closing screen |
| CN1580418A (en) * | 2003-08-08 | 2005-02-16 | 王进贤 | Plastic warp knitted vertical net windbreak sand-desert-preventing method |
| CN2732821Y (en) * | 2004-08-17 | 2005-10-12 | 天津市新奥环保节能设备有限公司 | Metal windshield |
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2006
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| DE19911002A1 (en) * | 1998-03-16 | 1999-09-23 | Baast Metaalwerken C V Van | Wind screen for deflecting wind to reduce dynamic pressure |
| FR2787474A1 (en) * | 1998-12-22 | 2000-06-23 | Deat Patrick | Panel type wind barrier has equidistant crosspieces supported by posts to form openwork fence and anchored in ground with posts |
| DE19908558A1 (en) * | 1999-02-27 | 2000-08-31 | Wilhelm Metzler | Wall as wind noise break uses upper variable surface riding up and down in side post guide grooves as required. |
| JP2002088719A (en) * | 2000-09-20 | 2002-03-27 | Shinichi Demachi | Protection net device against wind |
| JP2004298010A (en) * | 2003-03-28 | 2004-10-28 | Ushirozawa Shoten:Kk | System for simultaneously opening/closing screen |
| CN1580418A (en) * | 2003-08-08 | 2005-02-16 | 王进贤 | Plastic warp knitted vertical net windbreak sand-desert-preventing method |
| CN2732821Y (en) * | 2004-08-17 | 2005-10-12 | 天津市新奥环保节能设备有限公司 | Metal windshield |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1865636A (en) | 2006-11-22 |
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